Cutter-head.



, H. H. PLUMMER. CUTTER HEAD. APPLICATION FILED MAR- 30, 1,9l5.

Patnted July 18, 1916.

2 SHEETS-SHEET l- 'INI/EIVTOR 4 TTORNE Y8 TNE NORRIS PETE)? PHOTO-7N0.WASHINGYUN. E 5-- H. H. PLUMMEB.

CUTTER HEAD. APPLICATION FILED MAR. 30. 1915.

1,191,728. Patented July 18, 1916.

2 SHEETS-SHEET 2.

WIT/V588 Z7 l/JVE/VTOH 9 177 Z QmZJKPZQWZmer A T'TO/M/EYS m: NORRISPETE: m. Pwow 1mm. wasrunu mu, .7 c

UNITED STATES PATENT orrica HAROLD HATHAWAY PLUMMER, OF BERKELEY,CALIFORNIA.

CUTTER-HEAD.

Application filed March 30, 1915.

1 b all whom it may concern:

Be it known that I, HAROLD H. PLUMMER, a citizen of the United States,and residing at Berkeley, in the county of Alameda and State ofCalifornia, have invented certaln new and useful Improvements in Cutter-Heads, of which the following is a specification.

My invention relates to wood working machinery, particularly to thecutter heads thereof which carry the thin sheet steel blades or bits nowemployed, and one of the main objects thereof is to provide means forvarying the pitch or inclination of the bits or cutter blades at will.This I accomplish by making the bit carrier rotatable in the cutterhead, and I also provide means for locking said bit carriers in saidcutter head, means for securing said locking means in place, and meansfor feeding the blades or bits radially of the cutter head in the wearof said hits, as well as certain other details of construction ashereinafter specifically pointed out.

My invention is fully described in the following specification, of whichthe accompanying drawings form a part, in which like .referencecharacters are used to designate like parts in each of the views, and inwhich Figure l is a fragmentary end view of a cutter head provided withmy invention; Fi 2 is a section taken on the line 22 of Fig. 1: Fig. 3is an enlarged section taken on the line 33 of Fig. 2; Fig. 4 is asimilar section taken on the line 4.-i of Fig. 2;

Fig. 5 is an elevation of the bit carrier in the direction of the arrowX, Fig. 1; Fig. 6

is a section taken on the line 6-6 of Fig. 1;

Fig. 7 is an end view of the bit carrier; and Fig. 8 is a detached,plan, view of a locking plate which I employ.

In the drawings forming a part of this application I have shown a cutterhead 9 having a plurality of circular, longitudinally arranged, recesses10 intercepting the periphery of the cutter head at intervals, andwithin each of which is mounted a cylindrical bit carrier 11 for a bit12, said cutter head being further recessed at 13 on one side of each ofthe recesses 10 for a reason later explained. The bit carriers all beingalike, the description thereof will be limited to one, and attention isdirected to the cutting circle 1 1 of the bits 12.

Each carrier comprises a segmental cast- Specification of LettersPatent.

Patented July 18, 1916.

Serial No. 17,973.

faces ofsimilar projections 18 on a bar 19 movable longitudinally of theguide recess 16 the outer surface of said bar is convex and serves as acontinuation of the periphery of the bit carrier in relaxed position;rotatable in a removable plate 20 on one end of the bit carrier is athreaded and flanged bolt 21 which is engaged in one end of the bar 19,and it will be seen that rotation of the bolt 21 in either directionmoves the bar 19 correspondingly, longitudinally of the bit carrier, andlaterally thereof because of the inclined projections or wedges 17 and18, thus locking the bit carrier in its recess in the cutter head orreleasing it therefrom.

The bit 12 bears against the planetary side of the bit carrier, andinwardly of said bit the carrier is provided with a plurality of bores22 from one side of said carrier, parallel with each other and with saidbit, and extending about one-half the distance through the carrier; aplurality of similar bores 23, but of less depth, are provided from theopposite side of the carrier, one in the axis of each of the bores 22,

and joining the respective bores 22 and 23 are bores 29L of lessdiameter; seated in each of the bores 24 and rotatable therein is athreaded bolt 25, the head of which is of greater diameter than thecorrespond ing bore 24 and approximating that of the, bore 23, and eachof said bolts 25 is engaged in a nut 26 which is slidable in therespective bore 22 and provided with a lat eral projection 27 guided ina slot 28 in the plane face of the carrier, in line with each bore 22and formed thereby; these slots, while not shown in detail, serve toprevent the rotation of the nuts in the rotation of their respectivebolts, and the projections 27 bear against the inner edge of the bit 12,as is clearly shown in Figs. 3 and 4. By means of these bolts 25 the bit12 may be adjusted radially of the carrier to have the cutting edgethereof meet the cutting circle. To complete the cylindrical peripheryof the carrier, I provide a segmental member 29 which'has an inner planeface bearing on the outer surface of the bit 12, and serves to force thesame against the casting 15,

when the carrier is in locked position, and it will be seen that, if thebolt 21 be loosened, the bar 19 moves inwardly of the carrier and thuspermits the free rotation of the carrier in its recess in the cutterhead into adesired position, after which the carrier may again be lockedin the head.

lVhen it is desired to accomplish the op oration of jointing orgrinding, although all. need of the latter will probably be avoided, thecarriers are all rotated so as to bring the bits into greater angularitywith respect to the cutting circle 14:, thus bringing the edge thereofwhich is to be sharpened or ground into approximate concentricity withthe cutting circle, and in which position said bits are jointed orground; after this operation, the bits may be restored to normalpositions, and the honed or ground surface is then at a considerableangle to the cutting circle whereby only the cutting edge of the bitwill come into contact with the material beingworked. It will also beseen that I may look and unlock the carriers in adjusted positions bytightening or loosening but one screw or bolt for each carrier, and Imay adjust the bit outwardly of the carrier, after wear, by meanscarried by the carrier and forming a component part thereof. It willalso be seen that no holes, slots, projections, or equivalents need beprovided for the bits, they being merely strips of sheet steel, and,when the carrier is removed from the cutter head for any reason,immediate access is possible to the bit therein, in view of theseparate, se mental, member 29.

Vhile I have shown a present preferred form of embodiment of myinvention, it will be obvious that I am not limited to the details shownand described, but may make changes thereof, within the scope of thefollowing claims, without departing from the spirit of my invention, orsacrificing its advantages.

Having fully described my invention, what I claim is new, and desire tosecure by Letters Patent, is

l. A cutter head provided with a cylindrical recess, a bit carrierrotatable therein, means for locking said. carrier in desired positionwith respect to its recess, and means for radially adjusting said bitwith respect to its carrier.

2. A cutter head provided with a cylindrical recess, a bit carriertherein, a bit in said carrier, screw-threaded means for feeding saidbit outwardly of said carrier, and means for locking said carrier indesired position with respect to its recess and said head.

3. A cutter head provided with a cvlindrical recess, a cylindrical bitcarrier therein and comprising a main portion having inclinedprojections thereon, a bar similarly provided and bearing on saidprojections, means for adjusting said bar, a bit, and a se mental memberholding said bit to said main portion.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HAROLD HATH'AWAY PLUMMER.

lVitnesses:

TRAYLOR W. BELL, STANLEY J. SMITH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

